Evaluation of the economic impact of COVID-19 on Brazilian private dental clinics: a cross-sectional study - Villarim, Natália Lins de Souza; Muniz, Isis de Araújo Ferreira; Perez, Danyel Elias da Cruz; Martelli Júnior, Hercílio; Machado, Renato Assis (Work: a Journal of Prevention, Assessment, and Rehabilitation, 2022)